feat: require compliance confirmation for paid features

Gate payment, redemption, subscription, and invitation reward flows behind an audited compliance acknowledgement.

router/api-router.go

@@ -181,6 +181,7 @@ func SetApiRouter(router *gin.Engine) {
 		{
 			optionRoute.GET("/", controller.GetOptions)
 			optionRoute.PUT("/", controller.UpdateOption)
+			optionRoute.POST("/payment_compliance", controller.ConfirmPaymentCompliance)
 			optionRoute.GET("/channel_affinity_cache", controller.GetChannelAffinityCacheStats)
 			optionRoute.DELETE("/channel_affinity_cache", controller.ClearChannelAffinityCache)
 			optionRoute.POST("/rest_model_ratio", controller.ResetModelRatio)